Disclaimer… These numbers are seriously unscientific and heavily biased. It is based due to the sample. I probably excluded many cases.
Out of a hypothetical 720 positions applied,
|across java #few HFT||across c++||non-HFT||HFT|
|No. shortlisted based on CV||1/3 to 1/2 like 240||1/3 – 1/4 like 180||1/3  like 180|
|No. passing initial screening||2/3 like 160||2/3 i.e. 120||1/3 like 60|
|No. technical win||1/2 like 80||1/2 i.e. 60||20% i.e. 12|
 HFT firms are very open and welcomes everyone to apply